Putin accuses Ukraine of 'provocation' amid alleged border incursion
www.bbc.com
Fighting has been taking place since Tuesday, with footage showing smoke rising in some areas.

…

On Wednesday evening, Ukrainian MP Oleksiy Honcharenko said the Ukrainian army had established control over the Sudzha gas hub - a major gas facility involved in the transit of natural gas from Russia to the EU via Ukraine, which has continued despite the war. It is the only point of entry for Russian gas into the EU.

Although this has not been verified by the BBC, Mr Honcharenko’s comment was the first confirmation of an incursion into Russian territory by a Ukrainian official. Kyiv had previously not commented on reports of a cross-border attack.